Gum ball slot machine



FIG. 1 is a front and left perspective view of a gum ball slot machine showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right-side elevation view thereof;

FIG. 5 is a left-side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for gum ball slot machine, as shown. 